Package Sewage Treatment Plant’s (or PSTP’s) are often a suitable option where groundwater in the surrounding environment is vulnerable, drainage field percolation values are restrictive, or direct discharge to watercourse or surface water sewer is the preferred discharge method.

In addition to the anaerobic digestion taking place in the primary settlement tank (as septic tanks) the Ensign unit allows the clarified water to pass into a second ‘aeration’ chamber where it is treated to remove the dissolved constituents. Here aerobic bacteria, supported by diffused air and mobile media, ensure full treatment is achieved before the treated effluent (and ‘sloughed off’ bacteria) flow to a final settlement chamber prior to discharge.

- PSTP’s should be sized using the latest version of British Water Flows & Loads which provides detailed information on sewage production figures and sizing calculations.
- Regulatory authorities for the control of pollution in the UK normally require treatment plants conforming to BSEN12566:3 to be demonstrated as capable of producing a minimum effluent discharge quality of 20:30:20 (Biochemical Oxygen Demand; Suspended Solids; Ammoniacal Nitrogen in mg/ltr), although in certain areas more stringent site-specific qualities may be required.
- No surface water should enter the system as this can reduce the system’s capacity and cause solids to be flushed out which may prematurely block drainage field or cause pollution.
- As with septic tanks sludge should be removed annually or in line with manufacturers instructions.

MARSH INDUSTRIES Units 3-13 Addington Park Industrial Estate Little Addington, Kettering, Northamptonshire NN14 4AS sales@marshindustries.co.uk | +44 (0)1933 654582 www.marshindustries.co.uk ENSIGN BENEFITS

> Tested to BSEN12566:3 and CE-marked to ensure compliance with latest environmental and Building Regulations requirements Class-leading effluent quality of 11.5:19.2:8.4 (BOD:SS:NH4) ensures discharges well within national consent standards Three chamber system correctly sized for separation and retention of solids improves final effluent quality Standard or shallow options enable suitability for all site conditions (including driveways - subject to plinth/surround to prevent superimposed loadings) Shallow option ideal for groundworks involving bedrock or high water table as the low profile allows for safe, cost effective installation Low energy compressors ensure minimal running, maintenance and servicing costs High specification bio-media (310m³ per m²) and membrane diffusers ensure even circulation to eliminate ‘dead spots’ Internal recirculation (from final to primary chamber) continues treatment process to provide higher effluent quality whilst balancing flow over 24 hour period or periods of intermittent use Integral lifting eyes for improved on-site handling Unique ‘keying-in’ lip to assist anchoring into granular or concrete surround Optional extras include patented Polylok filter to further reduce suspended solids and extend life of drainage field; extensions for deep installations; pumped outlets for sites with adverse levels; and many more

ENSIGN SPECIFICATIONS

| Model | Length | Width | Height | Inlet | Ø | Outlet | Ø | |-------|--------|-------|--------|-------|---|--------|---| | 6 | 2602 | 1650 | 1935 | 550 | 110| 625 | 110| | 10 | 2602 | 1650 | 1935 | 550 | 110| 625 | 110| | 12 | 2860 | 1912 | 2139 | 550 | 110| 625 | 110| | 16 | 2860 | 1912 | 2284 | 720 | 110| 800 | 110| | 20 | 3650 | 1912 | 2284 | 770 | 160| 850 | 160| | 25 | 3650 | 1912 | 2284 | 770 | 160| 850 | 160| | 30 | 4550 | 1912 | 2284 | 770 | 160| 850 | 160| | 35 | 4550 | 1912 | 2284 | 770 | 160| 850 | 160| | 40 | 5200 | 1912 | 2284 | 770 | 160| 850 | 160| | 45 | 5200 | 1912 | 2284 | 770 | 160| 850 | 160| | 50 | 5200 | 1912 | 2284 | 770 | 160| 850 | 160|

All dimensions in mm

ENSIGN SHALLOW SPECIFICATIONS

| Model | Length | Width | Height | Inlet | Ø | Outlet | Ø | |-------|--------|-------|--------|-------|---|--------|---| | 6 | 2860 | 1912 | 1600 | 500 | 110| 575 | 110| | 10 | 2860 | 1912 | 1600 | 500 | 110| 575 | 110| | 12 | 2860 | 1912 | 1600 | 500 | 110| 575 | 110| | 16 | 3400 | 1912 | 1600 | 500 | 110| 575 | 110| | 20 | 4550 | 1912 | 1600 | 500 | 160| 575 | 160| | 25 | 4550 | 1912 | 1600 | 500 | 160| 575 | 160| | 30 | 5500 | 1912 | 1600 | 500 | 160| 575 | 160| | 35 | 5500 | 1912 | 1600 | 500 | 160| 575 | 160|

All dimensions in mm